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Full text of "Text Book Of Mechanical Engineering"

io6                            Forging Eyes.

blow being given by the hand holding the tongs. A second hea
is now taken, and the length of point having been marked off (c
the remainder is set down at D, on the edge of the anvil Hen
again the bar is turned backward and forward to finish the edge*
in plan E, and the end is chipped off at e to proper length
Before the work is too cool the part e must be bent round the
beak of the anvil, as shewn at F, when the holdfast is complete.

A Single-Eye in the form of an eye bolt is shewn finished
at A, Fig. 107 (page 103). The hole is to be drilled out afterward
A short piece of round bar is first taken of the same diameter as the
collar, and after heating is fullered at B, and set down as at c. Or
the second heat the edges are hammered, and the corners chipped
off with chisel as at D, shewn in plan. One end of the eyebolt is
thus finished. Taking a third heat the line E E is marked off, and
the tail of the bolt swaged down at F. Finally, the shank is cut
off to the required length.

We will now describe the forging of a Double-Eye. A in
Fig. 108 gives the finished form, serving as the end of a tie or
connecting rod, to which it is welded when required. A square
bar is taken (exact length of no importance) rather thicker than
the part marked ay and is first heated, jumped, or upset as at B,
and then flattened out in swage block till it assumes the form
shewn at c. Being heated a second time it is drawn out as at D,
partly on anvil, and partly by returning it to the hole in the swage
block, when it is finished off at the ends by chipping off the
corners shewn at E. A third heat is required to bend the T thus
formed round the anvil beak to the fork shape F, and the fourth
and last heat will serve: first, to hammer out the octagonal por*
tion; and, second, to swage out the round part H.

A Pin with cotter is our next forging. After heading at the
first heat, like the bolt in Fig. 104, it is then of the form BJ
Fig. 109. On the second heat it is cut to the length required,
and the cotter hole marked off. The latter is c driftedJ through
by means of the tool c—first, with the work lying in a bottom
swage; and, second, to finish—by driving the tool through, over
a hole in the anvil, see D. In punching and drifting the tool must
be kept cool by taking it out of the work, and dipping in the;
water tank from time to time. A represents the finished pia The